1.12
SCSI
Bus Drivers/Receivers
The drive use open collector drivers. All signals are tenninated with 220
n to
+5
voe (nominal) and 330 a to ground. The tenninating resistors
are removable for multi-drive configuration.
For these measurements,
SCSI bus termination
Is
assumed to be exter-
nal to the
drive. A typical drive is supplied with the resistor termination
packs
installed.
Signals driven
by the drive have the following output characteristics,
when measured at the
drive connector:
Signal true:
Signal false:
o.o
voe to
o.4
voe
2.5 voe to 5.25 voe
Signals received by the drive must have the following input characteris-
tics, when measured at the
drive connector:
Signal true:
Maximum total input load:
Signal false:
Minimum
Input Hysteresis:
o.o
voe to
o.s
voe
-0.4 mAmps @ 0.4 voe
2.0 voe to 5.25 voe
0.2VOe
12 ST125N/138N/157N Product Manual, Rev. C
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